Paintbrush



Patented Feb. 19, 1924.'

y UNITED STATES PATENT OFFICE.

JOSHUA KING- NORTHRUP, 0F ELLICOTTVILLE, NEW YORK.

PAINTBRUSH.

Application led July 18,

To all whom t may concern:

lie it known that l, JOSHUA KING Non- 'ii-nznr, a citizen of the United States, residing at `llllicottville, in the county of Gattaraugus and State of New York, have invented new and useful Improvements in Paintbrushes, of which. the following is a specification.

This invention relates to an improvement in brushes having adjustable bristles and designed more particularly for paint brushes, although it is also applicable to brushes for other purposes.

The object of the invention is the construction of a brush of this type which does away with the bridle commonly employed for stiffening the bristles of new brushes, which. permits the same result to be attained by longitudinal adjustment of the bristles in the brush-stock and which at the same time furnishes a irm backing for the butt-ends of the bristles or bristle-unit in all adjustments thereof.

In the accompanying drawings: Figures 1 and 2 are longitudinal sections of the improved brush, at right angles to each other, showing the bristles drawn into the socket of the stock to their full limit. Figures 3 and 4 are similar sections, showing the bristle-head adjusted forwardly to projectthe bristles to a greater extent after having become partly worn ofi".

Similar characters of reference indicate corresponding parts throughout the several views.

l0 indicates the head or stock of the brush which has a suitable handle 11 on its rear side and a comparatively deep laterally elongated socket or chamber 12 in its front side which receives the bristles 13. These are longitudinally adjustable in said socket as a unit, so that when the bristles are new and of full length, they may be drawn fully into the socket to render them sutiiciently stitf while as they become worn they may be eX- tended more or less to give them the necessary fiexibility.

For this purpose the butt-ends of the bristles are preferably bound with a band 1,4 and vulcanized or otherwise secured thereto and to a substantially Hat transverse tongue or head 15. These parts are snugly fitted in the socket, but their depth is Preferably less than that of the socket, as shown.

Extending rearwardly fromv the central 1922. Serial No. 575,845.

portion of the tongue 15 is a screwl bolt or rod 16 which passes through a smooth longitudinal bore 17 of the handle 11 and engages a clamping nut 18 yabutting against the rear end of the handle. This nut isv preferably provided with a reduced forward extension or sleeve 19 seated in a recess 2U .in the adjacent portion of the handle. The nut may also be provided with lateral openings 21 to receive a rod. or other implement for tightening it.

Then the bristles are new or uneven, they and their carrying head 1.5 occupy the position shown in Figs. 1 and 2, said head and the butt ends of the bristles bearing against the inner or rear end of the socket where they are tightly held by the screw bolt 16 and the nut '18. The socket isrof such dimensions as to surround the bristles to a suiicient depth to give them the desired stiffness.

lVhen the bristles become shorter by wear, the nut is removed and the bristles together with the screw bolt are removed from the socket and handle as a unit. One or more shims or washers 22 of a suitable thickness are then placed in the bottom of the socket and the bristle-unit is replaced therein against the shims and again secured in place by means of the clamping nut. As the bristles continue to wear, they can by this means be advanced or adjusted. forwardly in the socket from time to time by inserting additional shims, thus great-ly lengthening the life of the brush and at the same time obtaining the desired degree of flexibility or stiffness of the bristles in all adjustments. The shims 22 which may be made of cork, rubber or like material, not only form a tirm and solid backing for the bristle-unit when the same is advanced or adjusted forwardly in its socket and relieve the screw-bolt and clamping nut from longitudinal strain, but they also form a seat to keep the paint from working back through the handle-bore and reaching the painter-s hands. l

When the bristles become unservieeable, they can be readily replaced by a new unit, thus permitting the brush stock to be used over and over again and effecting an important saving.

The shims 22 may be of cork or any other appropriate material and are perforated for the passage of the screw bolt 16. They llt) forni a lirnl hacking `For (he bristle nnit in all its adjusinenls after Wear has taken place, (has holding the unit as securely alrer ars before the insertion ol one or more shinis.

The, brush stoe; and its haznlli. :1 re erahlyY consirneted or' aluminum.v bui y may he made olI anv odier Suitable ina'erial.

vi claim as my inven'ion:

l. pain! ni-ash ol the elnxraoler de,- ec 'hed comprising a sind; provided with :a laterally elongaled .wor-heil a' one Fido and an. integral handle extending; from inl opposil'e Side. said handle having a longifndinal hure opening` into Said Socke'. a lnislle-nnit adjustable lengihWi-Se, in Said Sockel to iner or diminish die efeet'ire length oi: die bristle'. said unit including a substantially flat transverse bristle-attaching head havin;r a sieren' bolli extending through said handle bore. l'iaeling means iiierpied lielween (hel lnll' end of the hrisle-nnit, and llie holorn ol' the soolie and lio 'ming a seal for preventing' the paint :lrom Working' through the handle llore. Said backing means being eonipressihle and dei'aehahie from said handle-Socket', and mians applied to the end of Said Soren' boliI for elainpie.;r the bris'le-unn' in place.

2. paint brush oli the character de- Scrihed, comprising a sroel( provided in im 'front Sido with a Sockel' and an iniegral handle extending Yfrom its rear aide'. :said handle having a lonfriludinal bore exending lherellnough and opening at its lron'L end ,into said Socket lh@ opposilo end ol. 'he handle being provided wifh a reves in axial alineinenlv with its bore.y a hritleamit adinstaliile lenghirise in Said sockel' lo inrwiae or diminir'sh ille. Effective length ol: ille. bristles, Said nuit' inrladiiir;r a liranrsversa supporting head and an oneirelin; hand lwlween Which The butt-ends ol' the lvrisflesi are*r Secured. Said head having an integra Serenlhol' extending ,rear\\'ard.l \Y l'herofrom throngli Said handle-bore info il1 recess. me or more Shinn; interposed howreen the lari und oi the bristle-unit and the hol'rnn .l ihe soekel and eonstilnling a solid marking for said nnir` and a elalnpinf; nalY appliid lio he rear end of said screw lioll and harhr;r a reduced lorvard extension engaging die recess in the adjacent end or' the handle,

JOSHUAv KING NORTH Hifi 

